Refrigerant Pressure Sensor
WARNING: This page is about a different car, the 2013 Nissan Leaf. However, it is still accessible from the selected car via links, so may be relevant.
The sensor uses an electrostatic volume pressure transducer to convert refrigerant pressure to voltage. VCM calculates refrigerant pressure based on the voltage and sends a refrigerant pressure signal to the A/C auto amp. via EV system CAN communication.